The Gers (French: [ʒɛʁ(s)] ⓘ) is a 175-kilometre (109 mi) long river in southern France, left tributary of the Garonne.

It flows north through the départements Hautes-Pyrénées, Gers and Lot-et-Garonne.

The city Auch lies along the river Gers.

The name of the Gers appears in the sixth century as Ægirtius, de Egircio flumine and Gircius.

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